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铁锰复合氧化物对As(Ⅲ)、As(Ⅴ)的吸附研究及其在沼液中的应用

彭昌军1,姜秀丽1,计红芳1,王远鹏2,欧阳通1,李清彪1,2,3
(1 厦门大学环境与生态学院环境科学与工程系,福建 厦门 361102;2 厦门大学化学化工学院化学工程与生物工程系,福建厦门 361005;3 泉州师范学院化学与生命科学学院,福建 泉州 362000)

摘要:研究了铁锰复合氧化物(FMBO)吸附去除As(Ⅲ)、As(Ⅴ)的性能。结果表明FMBO 对As(Ⅲ)、As(Ⅴ)均具有较好的吸附能力,其饱和吸附量分别为111.10、71.40 mg·g−1。As(Ⅲ) 和As(Ⅴ) 是通过与FMBO 表面的Fe—OH 基团进行交换并形成内层络合物的形式被FMBO 吸附,且As(Ⅲ)的吸附是吸附和氧化共同作用的结果。另外,沼液中共存离子对As(Ⅲ)和As(Ⅴ)的吸附有不同的影响。Zn2+能够增加FMBO 对As(Ⅲ)、As(Ⅴ)的吸附量,且增加幅度随着Zn2+浓度的增加而增加;磷酸根对As(Ⅲ)、As(Ⅴ)的吸附有明显的抑制作用,当磷与砷的分子摩尔比为1 时,FMBO 对As(Ⅲ)、As(Ⅴ)的吸附量分别降低了34.70%、31.50%;但是有机物(腐殖酸、动物蛋白及尿素)对FMBO 吸附As(Ⅲ)、As(Ⅴ)的影响不大。利用FMBO 对实际沼液中的砷进行吸附,结果表明砷的去除率平均达到65%左右,使吸附后某些沼液中砷的浓度达到生活饮用水标准和地表水排放标准。因此,将FMBO 用于砷污染的沼液及水体的治理具有很好的应用前景。
    关键词:铁锰复合氧化物;砷;吸附;氧化;沼液
    DOI:10.3969/j.issn.0438-1157.2014.05.041
    中图分类号:X 703.1 文献标志码:A 文章编号:0438—1157(2014)05—1848—08

Adsorption behavior of Fe-Mn binary oxide towards As(Ⅲ) and As(Ⅴ) and itsapplication in biogas slurry
    PENG Changjun1,JIANG Xiuli1,JI Hongfang1,WANG Yuanpeng2,OUYANG Tong1,LI Qingbiao1,2,3
    (1Department of Environment Engineering,School of Environment and Ecology,Xiamen University,Xiamen 361102,Fujian,China;2Department of Chemical and Biochemical Engineering,School of Chemistry and Chemical Engineering,Xiamen University,Xiamen361005,Fujian,China; 3School of Chemistry and Life Science,Quanzhou Normal University,Quanzhou 362000,Fujian,China)

Abstract:The adsorption behavior of arsenite (As(Ⅲ)) and arsenate (As(Ⅴ)) by Fe-Mn binary oxide (FMBO) was studied. The results indicated that FMBO had strong adsorption ability to both As(Ⅲ) and As(Ⅴ) and the maximum adsorption capacity was 111.10, 71.40 mg·g−1 respectively. As(Ⅲ) and As(Ⅴ) were adsorbed on FMBO surface through forming inner-sphere surface complexes by ligand exchange with hydroxyl groups, and As(Ⅲ) removal by FMBO was through an oxidation and adsorption combined process. In addition, the influences of co-existing substances generally present in biogas slurry were examined. Zinc ion could promote As(Ⅲ) and As(Ⅴ) adsorption on FMBO and the adsorption capacity increased with increasing zinc ion concentration.Phosphate had significant effect on As(Ⅲ) and As(Ⅴ) removal. When P/As ratio was equal to 1, the adsorption capacity of As(Ⅲ) and As(Ⅴ) was reduced by 34.70%, 31.50%, respectively. However, organics, such as humic acid, animal protein and carbamide had no significant effect on As(Ⅲ) and As(Ⅴ) removal. Moreover, FMBO as adsorbent for removal arsenic of actual biogas slurry was investigated. The average removal rate of arsenic of actual biogas slurry was about 65%, decreasing the arsenic concentration of some biogas slurry to the drinking water and surface water discharge standard. Therefore, FMBO could be an attractive adsorbent for both As(Ⅴ) and As(Ⅲ) removalfrom biogas slurry.
    Key words:Fe-Mn binary oxide;arsenic;adsorption;oxidation;biogas slurry

引 言
    沼气工程近年来在中国迅猛发展,沼气工程在处理畜禽粪便、农作物秸秆等废弃物生产沼气的同时,也会产生大量的沼液这一副产物[1]。由于沼液中含有大量的有机物、氨氮和丰富的磷元素,因此在农业上被广泛使用比如直接施肥、浸种等,然而,沼液中同时含有大量的重金属如As、Zn、Cu 等[2-3],污染农产品并危害人体健康。前期项目组在调查全国沼气工程沼液组分时发现砷是沼液中主要污染物,如果沼液中的砷不经处理直接排放必将造成严重的环境污染。因此,研究沼液中的砷的去除对于沼液的进一步开发利用显得非常重要。

铁锰复合氧化物对As(Ⅲ)、As(Ⅴ)的吸附研究及其在沼液中的应用


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